3 // Renesas R-Car SSIU/SSI support
13  * SSI interrupt status debug message when debugging
63 #define	EN		(1 <<  0)	/* SSI Module Enable */
79 #define SSI_NAME "ssi"
103 #define RSND_SSI_NO_BUSIF		(1 << 1) /* SSI+DMA without BUSIF */
109 		((pos) = ((struct rsnd_ssi *)(priv)->ssi + i));		\
112 #define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id)
115 #define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io))  argument
125 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_use_busif()  local
131 	if (!(rsnd_flags_has(ssi, RSND_SSI_NO_BUSIF)))  in rsnd_ssi_use_busif()
272 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_master_clk_start()  local
294 	if (ssi->usrcnt > 0) {  in rsnd_ssi_master_clk_start()
295 		if (ssi->rate != rate) {  in rsnd_ssi_master_clk_start()
296 			dev_err(dev, "SSI parent/child should use same rate\n");  in rsnd_ssi_master_clk_start()
300 		if (ssi->chan != chan) {  in rsnd_ssi_master_clk_start()
301 			dev_err(dev, "SSI parent/child should use same chan\n");  in rsnd_ssi_master_clk_start()
318 	 * SSI clock will be output contiguously  in rsnd_ssi_master_clk_start()
322 	 * for SSI parent  in rsnd_ssi_master_clk_start()
327 	ssi->cr_clk = FORCE | rsnd_rdai_width_to_swl(rdai) |  in rsnd_ssi_master_clk_start()
329 	ssi->wsr = CONT;  in rsnd_ssi_master_clk_start()
330 	ssi->rate = rate;  in rsnd_ssi_master_clk_start()
331 	ssi->chan = chan;  in rsnd_ssi_master_clk_start()
348 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_master_clk_stop()  local
356 	if (ssi->usrcnt > 1)  in rsnd_ssi_master_clk_stop()
359 	ssi->cr_clk	= 0;  in rsnd_ssi_master_clk_stop()
360 	ssi->rate	= 0;  in rsnd_ssi_master_clk_stop()
361 	ssi->chan	= 0;  in rsnd_ssi_master_clk_stop()
373 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_config_init()  local
374 	u32 cr_own	= ssi->cr_own;  in rsnd_ssi_config_init()
375 	u32 cr_mode	= ssi->cr_mode;  in rsnd_ssi_config_init()
376 	u32 wsr		= ssi->wsr;  in rsnd_ssi_config_init()
454 	ssi->cr_own	= cr_own;  in rsnd_ssi_config_init()
455 	ssi->cr_mode	= cr_mode;  in rsnd_ssi_config_init()
456 	ssi->wsr	= wsr;  in rsnd_ssi_config_init()
461 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_register_setup()  local
463 	rsnd_mod_write(mod, SSIWSR,	ssi->wsr);  in rsnd_ssi_register_setup()
464 	rsnd_mod_write(mod, SSICR,	ssi->cr_own	|  in rsnd_ssi_register_setup()
465 					ssi->cr_clk	|  in rsnd_ssi_register_setup()
466 					ssi->cr_mode	|  in rsnd_ssi_register_setup()
467 					ssi->cr_en);  in rsnd_ssi_register_setup()
471  *	SSI mod common functions
477 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_init()  local
487 	ssi->usrcnt++;  in rsnd_ssi_init()
507 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_quit()  local
513 	if (!ssi->usrcnt) {  in rsnd_ssi_quit()
522 	ssi->usrcnt--;  in rsnd_ssi_quit()
524 	if (!ssi->usrcnt) {  in rsnd_ssi_quit()
525 		ssi->cr_own	= 0;  in rsnd_ssi_quit()
526 		ssi->cr_mode	= 0;  in rsnd_ssi_quit()
527 		ssi->wsr	= 0;  in rsnd_ssi_quit()
556 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_start()  local
570 	 * SSI parent EN is not needed.  in rsnd_ssi_start()
575 	ssi->cr_en = EN;  in rsnd_ssi_start()
577 	rsnd_mod_write(mod, SSICR,	ssi->cr_own	|  in rsnd_ssi_start()
578 					ssi->cr_clk	|  in rsnd_ssi_start()
579 					ssi->cr_mode	|  in rsnd_ssi_start()
580 					ssi->cr_en);  in rsnd_ssi_start()
589 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_stop()  local
598 	cr  =	ssi->cr_own	|  in rsnd_ssi_stop()
599 		ssi->cr_clk;  in rsnd_ssi_stop()
607 		rsnd_mod_write(mod, SSICR, cr | ssi->cr_en);  in rsnd_ssi_stop()
611 	/* In multi-SSI mode, stop is performed by setting ssi0129 in  in rsnd_ssi_stop()
618 	 * disable SSI,  in rsnd_ssi_stop()
624 	ssi->cr_en = 0;  in rsnd_ssi_stop()
731 	 * SSIP (= SSI parent) needs to be special, otherwise,  in rsnd_ssi_get_status()
732 	 * 2nd SSI might doesn't start. see also rsnd_mod_call()  in rsnd_ssi_get_status()
734 	 * We can't include parent SSI status on SSI, because we don't know  in rsnd_ssi_get_status()
735 	 * how many SSI requests parent SSI. Thus, it is localed on "io" now.  in rsnd_ssi_get_status()
762  *		SSI PIO
813 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_common_probe()  local
818 	 * SSI Multi secondaries  in rsnd_ssi_common_probe()
824 	 * It can't judge ssi parent at this point  in rsnd_ssi_common_probe()
829 	 * SSI might be called again as PIO fallback  in rsnd_ssi_common_probe()
839 	if (!rsnd_flags_has(ssi, RSND_SSI_PROBED)) {  in rsnd_ssi_common_probe()
840 		ret = request_irq(ssi->irq,  in rsnd_ssi_common_probe()
845 		rsnd_flags_set(ssi, RSND_SSI_PROBED);  in rsnd_ssi_common_probe()
855 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_common_remove()  local
858 	/* Do nothing if non SSI (= SSI parent, multi SSI) mod */  in rsnd_ssi_common_remove()
863 	if (rsnd_flags_has(ssi, RSND_SSI_PROBED)) {  in rsnd_ssi_common_remove()
864 		free_irq(ssi->irq, mod);  in rsnd_ssi_common_remove()
866 		rsnd_flags_del(ssi, RSND_SSI_PROBED);  in rsnd_ssi_common_remove()
873  *	SSI PIO functions
879 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_pio_interrupt()  local
880 	u32 *buf = (u32 *)(runtime->dma_area + ssi->byte_pos);  in rsnd_ssi_pio_interrupt()
898 	byte_pos = ssi->byte_pos + sizeof(*buf);  in rsnd_ssi_pio_interrupt()
900 	if (byte_pos >= ssi->next_period_byte) {  in rsnd_ssi_pio_interrupt()
901 		int period_pos = byte_pos / ssi->byte_per_period;  in rsnd_ssi_pio_interrupt()
908 		ssi->next_period_byte = (period_pos + 1) * ssi->byte_per_period;  in rsnd_ssi_pio_interrupt()
913 	WRITE_ONCE(ssi->byte_pos, byte_pos);  in rsnd_ssi_pio_interrupt()
923 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_pio_init()  local
926 		ssi->byte_pos		= 0;  in rsnd_ssi_pio_init()
927 		ssi->byte_per_period	= runtime->period_size *  in rsnd_ssi_pio_init()
930 		ssi->next_period_byte	= ssi->byte_per_period;  in rsnd_ssi_pio_init()
940 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_pio_pointer()  local
943 	*pointer = bytes_to_frames(runtime, READ_ONCE(ssi->byte_pos));  in rsnd_ssi_pio_pointer()
971 	 * SSI Multi secondaries  in rsnd_ssi_dma_probe()
980 	/* SSI probe might be called many times in MUX multi path */  in rsnd_ssi_dma_probe()
995 	 * SSI .probe might be called again.  in rsnd_ssi_fallback()
1018 	 * If not, "rcar_sound.ssi" will be used.  in rsnd_ssi_dma_req()
1039 	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);  in rsnd_ssi_debug_info()  local
1050 	seq_printf(m, "chan:            %d\n",		ssi->chan);  in rsnd_ssi_debug_info()
1051 	seq_printf(m, "user:            %d\n",		ssi->usrcnt);  in rsnd_ssi_debug_info()
1084  *		ssi mod function
1099 	/* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */  in rsnd_ssi_connect()
1170 	struct rsnd_ssi *ssi;  in rsnd_ssi_probe()  local
1184 	ssi	= devm_kcalloc(dev, nr, sizeof(*ssi), GFP_KERNEL);  in rsnd_ssi_probe()
1185 	if (!ssi) {  in rsnd_ssi_probe()
1190 	priv->ssi	= ssi;  in rsnd_ssi_probe()
1205 		ssi = rsnd_ssi_get(priv, i);  in rsnd_ssi_probe()
1218 			rsnd_flags_set(ssi, RSND_SSI_CLK_PIN_SHARE);  in rsnd_ssi_probe()
1221 			rsnd_flags_set(ssi, RSND_SSI_NO_BUSIF);  in rsnd_ssi_probe()
1223 		ssi->irq = irq_of_parse_and_map(np, 0);  in rsnd_ssi_probe()
1224 		if (!ssi->irq) {  in rsnd_ssi_probe()
1235 		ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk,  in rsnd_ssi_probe()
1255 	struct rsnd_ssi *ssi;  in rsnd_ssi_remove()  local
1258 	for_each_rsnd_ssi(ssi, priv, i) {  in rsnd_ssi_remove()
1259 		rsnd_mod_quit(rsnd_mod_get(ssi));  in rsnd_ssi_remove()